基于球缝模型优化反演的裂缝储层评价新方法  

Novel evaluation of fracture-type reservoir based on optimization inversion of Sphere-Fracture Model

作　　者：刘诗琼 石强[3] 汤继周 刘堂晏[2] 赵文君 陈鹏[3] LIU ShiQiong;SHI Qiang;TANG JiZhou;LIU TangYan;ZHAO WenJun;CHEN Peng(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]同济大学海洋地质国家重点实验室,上海200092 [3]中国石油勘探开发研究院,北京100083

出　　处：《地球物理学报》2022年第4期1451-1460,共10页Chinese Journal of Geophysics

基　　金：国家高技术研究发展计划(863计划)(2006AA06Z214);国家自然科学基金(41476027);中国石油重大专项(2017ZX05001004-005)资助.

摘　　要：裂缝型储层评价是复杂油气田评价的难题之一,而且,针对裂缝型储层的勘探需求也在日益增加.本文将裂缝型储层中的裂缝归纳为裂缝与孔隙两个基本类型,然后,叠加裂缝与孔隙,在不同尺寸的配置关系下形成球缝模型.根据球缝模型提出孔隙结构参数的寻优方法,结合现有的反演算法,形成针对核磁测井回波的优化反演算法,基于优化反演结果可获取裂缝均值宽度、孔隙半径、分选系数、峰态和其他孔隙结构参数.对比分析孔隙结构参数与储层品质因子及油气产量之间的关系,可以发现孔隙结构参数与储层品质因子具有很好的相关性,与储层测试产量也有良好的相关性.对比结果说明,基于球缝模型反演的储层孔隙结构参数,对于裂缝型储层的物性具有很好的刻画效果.因此,本文的研究成果对于提高裂缝型储层的评价质量具有潜在的应用前景.It is still a challenge for evaluating fracture-type reservoirs in the complex oil and gas fields,and the exploration requirements of this fracture reservoir are increasing day by day.In this paper,all the porous space in the fracture-type reservoir can be categorized into two basic types,the fractures and the pores.Then,the fractures and the pores are superimposed to form a Sphere-Fracture Model(SFM)under the configuration of different sizes.According to the SFM,an approach for the parameter optimization of pore structure is developed in this study.Combined with the existing inversion algorithms,an optimized algorithm for NMR(Nuclear Magnetic Resonance)logging echo is developed and it can be used for determining the average fracture width,the radius of spherical pore,the sorting coefficient,the kurtosis,and other pore structure parameters as well.From the comparative analyses of the pore structure parameters with the reservoir quality factor and oil and gas production,it can be found that the pore structure parameters show a good correlation with both the reservoir quality factor and the formation testing production,which illustrates that the pore structure parameters derived from the inversion of the SFM show a good performance in describing the physical properties of the fracture-type reservoir.Thus,our investigations in this paper enable to provide a potential application to improve the evaluation of fracture-type reservoir.

关 键 词：裂缝储层 核磁共振 测井评价 孔隙结构 储层物性 回波反演 

分 类 号：P631[天文地球—地质矿产勘探]